spent 10 days in Cb with my classic toons and classic guild. in the castle tower we saw 500 cents, 300 oracles, 250 Empp Crush, 2 Dvinns, and onyl 1 Prophet in 10 days.
killed him dropped drow note, spellbook, and the head
In Crushbone (regular low level zone): The prophet is found near Emperor Crush
In Crushbone (Level 90 revamp): (no data)
In Crushbone (Level 90 Raid): Part of the "Demise of the Emperor" mini-raid event (see this quest entry for event and loot information).